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Should we redefine the classic lateral pallium?

Mario F Wullimann1

  • 1Graduate School of Systemic Neurosciences and Department of Biology II, Ludwig-Maximilians Universität Munich, D-82152 Planegg, Germany.

The Journal of Comparative Neurology
|September 28, 2016
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Summary

The revised telencephalic pallium model redefines the mammalian ventral pallium's role, now including the olfactory cortex. This research clarifies the origins of brain regions like the insular cortex and olfactory cortex.

Keywords:
claustrumdorsal palliuminsulaisocortexpiriform cortex

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Area of Science:

  • Neuroscience
  • Comparative Anatomy
  • Developmental Neuroscience

Background:

  • The quadripartite model of the amniote telencephalic pallium includes medial, dorsal, lateral, and ventral pallium.
  • Previous understanding attributed the olfactory cortex to the lateral pallium.

Purpose of the Study:

  • To propose a revised model of the mammalian telencephalic pallium.
  • To re-evaluate the developmental origins of the olfactory cortex and pallial amygdala.
  • To establish homologies between avian and mammalian pallial structures.

Main Methods:

  • Comparative analysis of telencephalic pallium organization in amniotes.
  • Histogenetic and developmental tracing of brain regions.
  • Reinterpretation of existing anatomical and developmental data.

Main Results:

  • The mammalian ventral pallium is proposed to give rise to the pallial amygdala and olfactory cortex.
  • The region previously identified as the lateral pallium is reclassified as a ventrolateral subdivision of the dorsal pallium, giving rise to the insular cortex/claustrum.
  • The avian mesopallium is homologous to the ventrolateral dorsal pallium, not the classic lateral pallium.
  • The original ventral pallium requires division into a smaller ventral pallium and a lateral pallium in the new model.

Conclusions:

  • The Watson/Puelles model refines the understanding of telencephalic pallium organization and evolution.
  • This revised model corrects misidentifications of pallial regions and establishes clearer homologies across amniotes.
  • The olfactory cortex's origin is reattributed to the ventral pallium, impacting models of brain evolution.